Glossary - Introduction to Carbon Capture and Sequestration - page 566

Retentate
The part of a gas mixture that does not pass through a membrane.
Robeson plot
In a Robeson plot, the selectivity of a mixture is plotted as a function of
the permeation of the component with the largest permeability. The
aim is to have a membrane with both a high selectivity and
permeability.
Scrubbing
Separating a gas mixture by liquid absorption.
See also absorption.
Self-diffusion coeffi cient
This coeffi cient characterizes the diffusion of a single molecule in a fl uid
of identical molecules. This type of diffusion at the molecular level can be
measured by labeling some of the molecules (e.g., by using Nuclear
Magnetic Resonance spectroscopy or NMR).
Sensible heat
The heat required to increase the temperature of the solvent to the des-
orption conditions.
Solubility trapping
Once trapped as small bubbles, the brine-CO 2 surface area increases
signifi cantly and this allows CO 2 to dissolve in the brine. The process of
CO 2 dissolving in brine is called solubility trapping.